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Orogenic Garnet Peridotite-Tools to Reconstruct Paleo-geodynamic Settings of Continental Collision Zones

Acta Geologica Sinica(English Edition) 2015年第A2期89卷 110-110页

作者： ZHANG Cong van roermund herman Institute of Geology Chinese Academy of Geosciences Beijing 100037 China Dept. of Earth Sciences Structural Geology and Tectonics Utrecht University Utrecht The Netherlands

Orogenic garnet peridotites （metamorphic rocks containing the characteristic HP garnet-olivine mineral assemblage） exposed in ancient orogenic belts may contain quantitative data regarding formation of subcontinental/ subcratonic lithosphere, evolution of a lithospheric mantle wedge, incorporation of garnet peridotite into subducted continental crust, subsequent （ultra-）high pressure metamorphism during ongoing continental subduction and final exhumation back to subcrustal levels.

关键词： RESEARCH Orogenic belts Garnet High pressure geosciences Olivine Peridotite Metamorphic rocks

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The Metamorphic Evolution and Tectonic Significance of the Sumdo High and Ultrahigh Pressure Metamorphic Terrane, Central-South Lhasa Block, Tibet

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 52-页

作者： ZHANG Cong Thomas BADER herman van roermund YANG Jingsui SHEN Tingting QIU Tian LI Peng Institute of Geology Chinese Academy of Geological Sciences School of Earth and Space Sciences Peking University Department of Earth Sciences Structural Geology and TectonicsUtrecht University

Asthemaintectoniccomponentofthe Himalayan–Tibetan orogen,the Lhasa terrane has received much attention as it records the entire history of the *** occurrence of high pressure eclogite in the Sumdo complex in central Lhasa terrane has a significant importance on the understanding of the Paleo-Tethys subduction and plate itineration processes in this *** petrological,geochemical and geochronological data of eclogite and associated blueschist and garnet-bearing mica schist from Sumdo,Jilang and Bailang area have been briefly reviewed to explore the origin and metamorphic evolution of this *** from the Sumdo complex have experienced low temperature,high pressure to ultrahigh pressure metamorphism,revealing a fastsubduction and exhumation process in a typical oceanic subduction *** large P-T range between different eclogites in the literature may be affected by the big error of unappropriated using geothermobarometry and may also because of slices of subducted blocks derived from different depths juxtapose together during *** summarizing the U-Pb,Lu-Hf and Sm-Nd ages of eclogites,the eclogite facies metamorphism is likely to occur in early Triassic during 245-225 Ma,but not the previously accepted late Permian at ca.260 Ma by the reinterpretation of the former geochronological data from *** opening of Paleo-Tethys Ocean between the Lhasa terrane initiate prior to ca.280 Ma and ultimate closure to integrate the Lhasa terrane was no earlier than225 Ma and may triggered by the initial subduction of Bangong-Nujiang Tethys Ocean in the north.

关键词： Tibet The Metamorphic Evolution and Tectonic Significance of the Sumdo High and Ultrahigh Pressure Metamorphic Terrane Central-South Lhasa Block

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